from django.shortcuts import render, get_object_or_404

# Create your views here.
from django.http import HttpResponse, Http404, HttpResponseRedirect
from django.template import loader
from django.db.models import F
from django.urls import reverse
from .models import Question, Choice


def index(request):
    latest_question_list = Question.objects.order_by("-pub_date")[:5]
    context = {"latest_question_list": latest_question_list}
    return render(request, 'polls/index.html', context)

    # latest_question_list = Question.objects.order_by("-pub_date")[:5]
    # template = loader.get_template('polls/index.html')
    # context = {"latest_question_list": latest_question_list}
    # return HttpResponse(template.render(context, request))

    # latest_question_list = Question.objects.order_by("-pub_date")[:5]
    # output = "，".join([q.question_text for q in latest_question_list])
    # return HttpResponse(output)

    # return HttpResponse("Hello, world. You're at the polls index.")


def detail(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, 'polls/detail.html', {'question': question})

    # try:
    #     question = Question.objects.get(pk=question_id)
    # except Question.DoesNotExist:
    #     raise Http404("Question does not exist")
    # return render(request, 'polls/detail.html', {'question': question})

    # return HttpResponse(f"You're looking at question {question_id}.")


def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, "polls/results.html", {"question": question})

    # return HttpResponse(f"You're looking at the results of question {question_id}.")


def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST["choice"])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the question voting form.
        return render(
            request,
            "polls/detail.html",
            {
                "question": question,
                "error_message": "You didn't select a choice.",
            },
        )
    else:
        selected_choice.votes = F("votes") + 1
        selected_choice.save()
        # Always return an HttpResponseRedirect after successfully dealing
        # with POST data. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))

    # return HttpResponse(f"You're voting on question {question_id}.")
